Why can the ordinary underground roots of a plant not carry out photosynthesis?

Объяснение

Photosynthesis can only happen where there are chloroplasts, and ordinary root cells have none, so exposing a root to light does not turn it into a sugar-making organ. Roots are absorbing structures: what they take from the soil is moisture and dissolved minerals, never food, and absorbing water does not prevent a cell from doing anything else.